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Finding the Fourth Proportional to 928.73, 1,393.12 and 343.87

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Solution

The fourth proportional to 928.73, 1,393.12 and 343.87 is: 515.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.73 : 1,393.12 = 343.87 : x
  2. Step 2: Convert to fraction form
    928.73/1,393.12 = 343.87/x
  3. Step 3: Cross multiply
    928.73x = 1,393.12 × 343.87
  4. Step 4: Simplify right side
    928.73x = 479,056.24
  5. Step 5: Solve for x
    x = 479,056.24/928.73
  6. Step 6: Final answer
    x = 515.82

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.